Feeding device



F. E. slNcLAl'R Sept. 17, 1940.

` FEEDING DEVICE 3' Sheets-Sheet l Original Filed Dec. 27, 1935 Sept 17,l940- F. E. slNcLAlR 2,214,753

FEEDING DEVICE Original Filed Dec. 27, 1935 3 Sheets-Sheet 2 SePt- 17,1940- F. E. slNcLAlR 2,214,753

FEED'ING DEVICE 3' Shcets-Sheet 5 Original Filed Dec. 27, 1935 9.44 www;

v/iig,

Patented Sept. 17, 1940 UNITED STATES PATENT orties.

FEEDING DEVICE Frank E2. Sinclair, Claremont, N.

H., assignor to Sullivan Machinery Company, a corporation ofMassachusetts 12 Claims.

My invention relates to feeding devices, and more particularly tofeeding devices particularly adapted for use with percussive motorswhich are to be fed in a guided path toward their work.

During the operation of percussive motors, there are set up longitudinalmovements thereof, as any one who has held. a runing hammer drill cantestify, and it is possible to employ the vibration or jarring of themotor just mentioned to feed the motor either toward. the Work orrearwardly from the work through appropriate apparatus, and it is anobject of my invention to provide an improved feeding apparatus for a'rock drill or other percussive motor operating on this principle. It isanother object of my invention to provide an improved vibration or jaroperated feeding mechanism in which forward and reverse feed may beaccomplished in a very effective manner and in which, moreover,regulated drilling motor movements at Widely varyin-g speeds may beaccomplished. It is a further object of my invention to provide animproved controlling mechanism for a vibration-operated feed, andproviding for definite and effective regulation of the rate of feedwhich such a mechanism accomplishes. These and. other advantages andobjects of the invention will be apparent in the course lof thefollowing specification and appended claims.

i 30 In the accompanying drawings, in which a preferred embodiment and.two modified forms of construction which my invention may assume inpractice have been shown for purposes of illustration,

l is a central longitudinal vertical section through a drillingapparatus in which the preferred embodiment of the invention isincorporated.

Fig. 2 is a plan View on an enlarged scale of the feed controllingapparatus housing.

Fig. 3 is a central vertical section on. approximately the same scale asthat of Fig. 2, through the feed controlling apparatus.

Fig. 4 is a transverse section on a still larger scale through Ithe feedcontrolling apparatus, the section being taken on the plane of the line4-4 of Fig. 3.

Fig, 5 is a generally similar sectional view .5v with some parts shownin elevation and some parts in a different position.

Fig. 6 is a transverse section on the plane of the line 6 6 of Fig. 3.

Fig. '7 is a similar view with the parts in a ,n.3 different position.

(Cl. Z55-45) Fig. 8 is a View similar to Fig. '7 with the'parts in astill diiferent position.

Fig. 9 is a perspective of a controlling element of the feed controllingapparatus.

Fig. 10 is a perspective of an operating element of the feed controllingapparatus.

Fig. l1 is a perspective of a wear insert.

Fig. 12 is a central vertical section through the feed controllingapparatus of a modified embodiment of my invention.

Fig. 13 is a vertical section on the plane of the line I3-I3 of Fig. l2.

Fig. 14 is a horizontal section on the plane of the line III- I4 of Fig.12 through the feed controlling apparatus.

Fig. l5 is a vertical transverse section on a smaller scaleI than Fig.6, but on an approximately similarly located plane, showing a differentfeed control mechanism.

Referring first to Figs. 1 to l1 inclusive of the drawings and thepreferred embodiment of the invention therein disclosed, it may beobserved that a motor I, which is herein shown as a hammer rockdrill,has a piston 2 whose striking bar 3 is adapted to actuate percussively adrill steel v 4 which is suitably supported by the drilling motor; andit will further be noted that the drilling motor is arranged for guidedlongitudinal feeding movements in a shell 5. The drilling motor has adepending feed nut bracket 5 in.w which there is non-rotatably mounted asuitably internally threaded feed nut l. The shell 5 has rearwardlyextended rods 8 surrounded by spacl ing sleeves 9 and supporting ahousing lil at the rear end of the rods in a well known manner, k

the essential difference from a standard drifter Ashell constructionresiding in the fact that the feed contro-l housing It) is arranged atthe rear end of the rods instead of a mere feed screw support and feedscrew rotating handle. A feed screw I I, which may advantageously beprovided with a somewhat steeper lead than is customary for ordinarydrifting drills of the hand fed type, extends through the feed nut 'Iand is rotatably supported at its front end in a support I2 carried bythe forward end. of the shell 5. The rearward end of the feed screw Iiis surrounded by a. sleevelike member I3 which is prevented fromrotation relative to the feed screw il by a key Ill,'and held againstlongitudinal movement relative to the feed screw by a nut I5 and lockwasher I6. A collar II on the feed screw and another collar I8 on thesleeve I3 cooperate respectively with a front head member I9 and a rearhead member 20 of the housing Ii) to pre- Y vent substantiallongitudinal movementl of the feed screw relative to the housing I9, andthe sleeve is journaled for rotation in a bearing ZI in the forward headmember I9 and a bearing 22 in the rearward head member 29. Asupplemental housing member 23 surrounds and encloses the collar I8, thenut I5, the washer I6, and the rear end of the feed screw II. Thehousing I comprises in addition to its front head I9 and rear head 29 alateral wall-forming member 25 which cooperates with the head membersmentioned to provide a chamber 26. This chamber comprises a rearward,generally cylindrical space 2'I and a forward lobelike space 28, thelatter space having a series of enlargements or lobelike spaces 29equi-distantly spaced around the axis of the space 28 and communicatingwith a smaller central space 39, it being understood that the lobelikespaces 29 and the central space 3B together make up the space 28. Thecentral space 30 is just about large enough to permit the free rotationtherein of the sleevelike member I3. The outer walls of the spaces 29are curved, but their curvature is not that o-f arcs struck on radiiequal toi the distance from the center of the space 3B to the centralpoint in each of said outer walls, but instead somewhat flatter incurvature. As a result, each of the three equally spaced spaces 29 hasan outer wall 3I which is nearer, adjacent the midpoint thereof, to` thecenter of the space 30 than at its ends. Within each of the severalspaces 29 there are arranged two rollers 32, which may for conveniencebe termed binding rollers and each of which is of a diameter greater'than the maximum distance between the wall 3E and the most closelyadjacent portion of the wall of the sleevelike member I3 which extendsthrough the space 39. Accordingly, as either of the rollers 32 movestoward said Zone of minimum dimension,v there will be a locking of thesleevelike member I3 and a holding of the latter against rotation. Onthe other hand, either roller, by movement away from the zone of minimumradial dimension, tends to free the sleevelike member i3. Each of therollers is pressed towards the Zone of minimum dimension of one of thespaces 29 by a spring-pressed follower 33 arranged in a suitable bore34. In the relatively cylindrical space 27 previously mentioned there isrotatably supported the generally annular fingered member 36, shown inperspective in Fig. 9. It will be observed that this member is providedwith three forwardly-extending substantially equally* space`d pin orfinger portions 3l, each of these pin or finger portions extending intoone of the spaces 29 and each of insuicient width circumferentially ofthe spaces to be simultaneously contacted by the rollers 32 at theopposite sides thereof. The member 36 is cut away chordally as at 38 andarcuately as at 39. Within the space provided at 39 there is slidablyarranged an arcuate member 40, and a` spring @I acts between a shoulder42 formed on the membei' 3E and the end 43 of member i9 to press themember @i9 towards the wall @Il of the cutaway 33 so that said wall 45,with the wall i5 at the nearer end of the arcuate member 99, provides,in eifect, a slot 45. Within a radially extending bore di' in the member25, there is rotatably supported the shank portion 58 of an operatinghandle 49. Said shank portion is provided with a circumferential groovewith which a holding pin 5I cooperates to hold the handle member 29 inoperative position, and an eccentric lug portion 52 formed on the innerend of the member 58 extends into the slot 36 previously mentioned andis adapted to cooperate with the walls M and i5 of said slot in themanner shortly to be described.

The wall of the member 35 is also cut away arcuately herein,approximately diametrically opposite the location .of the cut-awayportion 39, to provide a further arcuate recess 54 having an end wall 55which is adapted to cooperate with an adjustable limit screw 56 tocontrol the distance which the member 39 can be turned in one direction.The screw 56 is provided with a manually-operable enlarged portion 5iand is mounted in a bushing 58 arranged in a threaded bore 59 in theside wall of the housing member 25. To minimize wear and permit the useof materials especially adapted to long life and freedom fromroughening, the outer walls BI of the lobelike spaces 29 are not formedintegral with the member 25, but instead the member 25 is provided withthree recesses 50 in which hardened inserts 6I, formed of the propershape and suitably heat-treated, may be disposed.

The mode of operation ofthe apparatus so far described may now besummarized. In the position of the parts shown in Fig. 4, whichcorresponds to the full-line View of the handle 59 in Fig. 2, therollers 32 are all pressed by their followers 33 into contact with theperiphery of the sleevelike member i3, and of course simul-v taneously,into contact with the respective walls 3l of the several recesses 29.There will, therefore, be no rotation of the sleevelike member possible,as it will be locked against movement in any direction, and, thesleevelike member beingA locked, the feed screw I will also be locked.

If it is desired -to effect a movement of the drill in a directiontoward the rear of the shell, the handle 49 may be turned so as to causethe projection 52 to engage the wall 44 of the slot It and rotate themember 36 counterclockwise,

looking forwardly. vThis will cause the fingers 3l to engage the rollers32 which normally lock the sleevelike member ISagainst rotationclockwise, looking forwardly, and accordingly the sleevelike member i3can rotate clockwise (look ing forwardly), but not counterclockwise. Thetendency of the drill to jump forwardlyvproduces a counterclockwiserotation tendency on the part, `of the feed screw, still speaking ofdirections,

looking forwardly. That direction of rotation of thefeed screw isprevented with the adjustment of the member 3S which has just beendescribed,

for the three rollers 32 which have not been engaged by the fingers 3l'positively prevent such a direction of rotation of the feed screw. Anopposite jumping tendency on the part of the drill can, due to theholding of the other three rollers inactive, cause an actual rotation ofthe feed screw in a 4clockwise direction, looking forwardly, and such adirection of rotation of the feed screw within the feed nut I causes aretraction of the drilling motor. With the construction shown', thisretraction will be quite rapid at'high operating speeds of the drillingmotor, and it is not imperative to control the rate of retraction of thedrill, though this might be done by providing apparatus similar to thatwhich will now be described for controlling the rate o-f forward feed.

Depending upon the extent to which the ngers 3l are displaced from theirso-called central position, there will be different effects on therollers, and so on the rotative rate of the feed screw.

If the fingers 31 are moved just sufiiciently far to prevent the rollersfrom rolling inward to their maximum possible extent, but yet not farenough to prevent the rollers from exercising a substantial frictionaleffect, it will be appreciated that a` feed at a reduced rate will bepossible. Such an adjustment of the fingers 31 can be somewhat graduallymade manually, but it is extremely difficult to secure the preciseeffect desired, and even more difficult to maintain it, purely by manualadjustment of the handle 49. For that reason, the mechanismvincludingthe arcuate member 40, the spring 4i, the shoulder 55, and theadjustable stop screw 56 is provided; and it will be appreciated that byappropriate adjustment of the stop screw 56 the degree of rotation ofthe member 35 clockwise, looking forwardly, may be absolutelypredetermined, and through the provision of the yieldable arcuate member48, the handle 49 may be turned to the lower dotted position in Fig. 2and still not result in a rotation of the member 3B at all similar inextent to the rotative movement provided by a like opposite adjustmentof the handle 49. Now let us analyze what happens when'the handle 49 ismoved to the lower dotted-line position ofl Fig. 2. It will be notedthat this will materially displace the arcuate member 4D in 6 and willplace the spring 4l under considerable compression. As a result, thisspring acting on the shoulder 42 will rotate the member 3G clockwisejust as far as the engagement of the shoulder 55 with the end of thelimit screw 56 permits. Accordingly, depending upon the adjustment ofthe limit screw 56, the set of rollers 32 which control the effecting offorward feed will be more or less rendered inoperative, the more nearlythey are rendered inoperative (the less nearly they are permitted toapproach their innermost positions) the faster the resultant feed; andthe smaller the degree to which they are rendered inoperative the slowerthe resultant feed. All such feeds effected by partial renderinginoperative of the rollers will be sub-maximum, i. e., less than thefeed rate when such rollers are fully inoperative, Obviously, if thescrew 55 is adjusted well. toward the right in Fig. 6, an extremely slowfeed will result. If the stop screw 55 is adjusted a little furthertoward the left in Fig. 6, a slightly faster feed will be effected. Ifit is substantially withdrawn to the left, full speed forward feed maybe secured.

From the foregoing description it will be evident that with the deviceas illustrated a wide range of forward feeding speeds, each quitepositively maintained, may be secured, and through manual adjustment andholding of the lever 49 a variable rearward feeding speed can also beaccomplished. if that be necessary.

In Figs. l2, 13 and 14 a different device is shown for providinggraduated feeding rates. In this form of apparatus the control isequally variable during forward and reverse feed, for the basicprinciple of operation of this mechanism is a direct retardation of therotative movements of the feed screw before the rollers are reached inthe system.. In other words, the effect is that of braking the rotationof the feed screw and limiting for a given rotative force the degree ofturning irrespective of the fact that one or the other sets of rollersmay be rendered completely inoperative. This construction differs fromthe construction described with respect to Figs. l to 11 in twoparticulars. With it there is no necessity for the arcuate block 40, theadjustable stop screw 5E, etc., so both sides of the apparatus may bemade alike in the matter of the manual adjustment. The second particularof difference lies in the fact that a transverse slot is formed in therear head member 20' and within that slot 5 there is transverselyslidable a wedgelike element 64 which is cut away centrally as at 65\.toprovide yan opening of a vertical dimension equal approximately to theoutside diameter of the sleeve I3, 55 permitting a substantial lateralmovement of the wedgelike member 54. The wedgelike member 64 does nottaper from .top to bottom, but it does taper from end to end, and itsrearward surface B1 lies in a plane perpendicular to the 15 axis of thefeed screw, while its forward surface 68 lies in a plane makingy anangle with the axis of the feed screw, and the recess 63 has a forwardwall 69 parallel to the surface 58 of the wedgelike member. 10 tends toforce the wedgelike member G4 into releasing position, while anadjustable pressure screw 1l acting on the other end of the wedgelikemember may be moved to force said wedgelike member inwardly and increasethe friction-25 which the same exercises on the forward surface of thecollar IB on the sleeve I3.

The mode of operation of this apparatus will now be clear. Let it beassumed that the handle 49 be moved to a position equivalent to either30 of the dotted line positions shown in Fig. 2. It will be evident thenthat if the wedgelike member G4 is moved to a position to minimize itsfrictional engagement with the collar i8 a fast feed in thepredetermined direction will result, 35

because the feed screw will be free to turn just l as far as the jump ofthe drill tends to turn it. When it is desired to reduce the rate offeed, the screw member 1l may be adjusted to force the wedgelike member54 inwardly to increase.40

the friction between its surface 51 and the front face of the collar i8,and accordingly a given jumping force of the drill motor will not causeso great a rotation of the feed screw because of the resistance torotation of the feed screw than will be materially built up. Byappropriate adjustment of the member 1i and of the wedgelike member 54 awide range of feeding speeds may be secured. It is of course to beunderstood that the wedge angle of the member 64 is very smally |50 andthat the clearance between the rearward face B1 of said member and theforward surface of the collar I8 is a very small fraction of an inch,even when the wedgelike member 54 is in what may be called its fullyreleased position. `55

Fig. 15 shows another mechanism for controlling the rate of feed. Thisincludes means for holding the member 35 in virtually any position towhich it may be adjusted by manipulation of the handle 4Q. The member 36is cordingly with a similar member 36 which is cut away as at 15 toprovide an arcuate surface 16 with which'a brake shoe 11, eitherresiliently through a spring 18 or positively through the forward end ofthe screw 19, may be pressed-65 It will be evident that the handle 49may be adjusted to provide for the desired rate of feed and then heldthere by tightening up the screw 19 through its manually rotatable head89. This will positively hold the member 35" in whatever 70 position itmay be moved to. By backing off the screw 19 slightly, a more yieldingholding of the member 3,6 may be secured7 a holding adequate to positionthe member in virtually any desired position, but not sumcientlypositive to prevent and horizontally so as to provide a clearance '10 Aspring-actuated plunger 20 replaced ac- 60 the operator, should suddenneed for reverse feed arise, from quickly throwing the handle 49 to anopposite position.

It will be observed that I have provided in this application severaldifferent arrangements whereby maximum feeding rate and a plurality ofdefinite lesser feeding rates may be effected and maintained. Theinvention in each of its embodiments is of durable construction,practically proof against accidental derangement, subject to virtuallyno wear, easy to adjust, and, in two forms at least, capable ofpermitting immediate reversal of feed, if need arises, with no seriousdiiiculty despite the provision of arrangement for effecting feed at areduced rate. By the provision of the inserts previously described, thewear of the device as a whole may be reduced to a minimum and anytendency toward rucking can be absolutely prevented by the employment ofspecially heat treated materials particularly selected for theconditions involved in this apparatus.

While I have in this application specifically described a preferred formand two modifications in construction which my invention may assume inpractice, it will be understood that these are shown for purposes ofillustration only, and that the invention may be modified further andembodied in various other forms without departing from its spirit or thescope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In combination, a reciprocating-type motor, a guide therefor, saidmotor wheny running producing alternating tendencies to movementforwardly and rearwardly along said guide, members, of which one isrotatably mounted, respectively carried by the guide and by the motorand mutually interengaged so that movement of the motor along the guideis precluded except upon rotation of said rotatable member, oppositelyacting wedging means each normally operative to preclude materialrotation of said rotatable member in one direction but controllable toexert no material opposition to rotation of said rotatable member insaid direction or to restrict, but not preclude, rotation of saidrotatable member in said direction, controlling means for said wedgingmeans movable to determine the regulation which they exercise upon therotation of said rotatable member, and means including a stop device forlimiting controllingmeans movement to a position in which one of saidWedging means restricts but does not preclude rotation of said rotatablemember in one direction while the other wedging means substantiallywholly precludes opposite rotation of said rotatable member.

2. In combination, a reciprocating-type motor, a guide therefor, saidmotor when running producing alternating tendencies to movementforwardly and rearwardly along said guide, members, of which one isrotatably mounted, respectively carried by the guide and by the motorand mutually interengaged so that movement of the motor along the guideis precluded except upon rotation of said rotatable member, ieansnormally operative to preclude material rotation of said rotatablemember in one direction but controllable to exert no materialretardation upon the rotation of said rotatable member in said directionor to restrict, but not preclude, rotation of said rotatable member insaid direction, means normally operative to preclude material rotationof said rotatable member in the opposite direction but also controllableto exert no material retardation upon rotation of said member in saidopposite direction or to restrict, but not preclude, rotation of saidrotatable member in said opposite direction, controlling meanscooperative with said first and second mentioned means and movable todetermine the regulation exercised thereby upon rotation of saidrotatable member, and stop means arranged in a position positively topreclude movement of said controlling means in one direction beyond aposition in which restricted rotation of said rotatable member in onedirection is provided.

3. In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by thel guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said rotatable member, meansnormally operative vto preclude material rotation of said rotatablemember in one direction, means normally operative to preclude materialrotation of said rotatable member in the opposite direction, and meansadjustable to render one of said two means mentioned partiallyinoperative including abutment means for controlling the degree of itspartial inoperativeness.

e. In com-bination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said, rotatable member, meansnormally operative to preclude material rotation of said rotatablemember in one direction, means normally operative to preclude materialrotation of said rotatable member in the opposite direction, and meansadjustable to render one of said two means mentioned partiallyinoperative including adjustable-stop motion-limiting means forcontrolling the degree of its partial inoperativeness.

5. In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged *so that movement of the motor alongYthe guide is precluded except upon rotation of said rotatable member,means normally operative to preclude material rotation of said rotatablemember in one direction, means normally operative to preclude materialrotation of said rotatable member in the opposite direction, and meansfor positively moving one of said means into a partially operativeposition and for yieldingly moving the other into a partially operativeposition including a yieldable operating connection and a device forpositively limiting the movement imparted by said yieldable connection.

6. In a feeding device, in combination, a motor and a support on whichsaid motor is slidably mounted, said motor having a recipro- Vcatoryhammer piston whose reversals ofY motion tend to move the motor.longitudinally of the support, means for restraining such movementoperatively connected to the motor and the support and comprising apair/of members in threaded engagement with each other andfone of whichmembers is adapted'to be rotated by the other member upon movement ofsaid motor on the support, stop means forr selectively controlling thedirection of rotationof the rotatable member to enable the motor to beadvanced and retracted with respect to thesupport by the piston, andwedge means including a wedge movable bodily transversely of saidrotatable member and a coacting surface'perpendicular to the axis ofrotation of said rotatable member and turning with the latter forretarding the rate of rotation of said rotatable member.

7. In a feeding device, in combination, a motor and a support on whichsaid motor is slidably mounted, said motor having a reciprocatory hammerpiston whose reversals of motion tend to move the motor longitudinallyof the support, means for restraining such movement operativelyconnected to the motor and the support and comprising a pair of membersin threaded engagement with each other and one of which members isadapted to be rotated by the other upon movement of 4said motor on thesupport, stop means for selectively controlling the direction ofrotation of the rotatable member to enable the motor to be advanced andretracted with respect to the support by the piston, and controllingmeans for said stop means having means, including devices for stoppingmovement effected thereby in predetermined positions, for enablingpredetermined positioning thereof for sub-maximum feeds.

8. In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said rotatable member, meansnormally operative to preclude material rotation of said rotatablemember in one direction including frictional binding means and means forpressing the same resiliently into a position substantially precludingrotation of said rotatable member in said direction, means normallyoperative to preclude material rotation of said rotatable member in theopposite directionv including frictional binding means and means forpressing the same resiliently into a position precluding substantialrotation of said member in said opposite direction, a member adjustableoppositely from a predetermined intermediate position to control saiddifferent frictional binding means, and adjustable-stop means forlimiting the movement of said last mentioned member in one direction toa position in which it renders one of said frictional binding means onlypartially inoperative.

9. In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said rotatable member, meansnormally operative to preclude material rotation ofl said rotatablemember in one direction, means normally operative to preclude materialrotation of said rotatable member in the opposite direction, meansvariably adjustable'to render one of said two means ineffective todifferentdegrees, and detent means for automatically maintaining saidadjustable means in its various adjusted positions.

. 10.'In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when u running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, ofl whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said rotatable member, meansnormally operative to preclude material rotation of said rotatablemember in one direction, means normally operative to preclude materialrotation of said rotatable mem,- ber in the opposite direction, meansadjustable to control the action of said rotation-precluding means, andcontrolling means for said adjustable means movable to .opposite extremepositions respectively to cause said adjustable means positively torender one of said rotation-precluding means completely inoperative andto move said adjustable means yieldingly to a point to render the otherrotaton-precluding means partially inoperative, said adjustable meanshaving a stop associated with it to limit its movement in the lastmentioned direction to the point specified. l

11. In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said rotatable member, meansnormally operative to preclude material rotation of said rotatablemember in one direction, means normally operative to preclude materialrotation of said rotatable member in the opposite direction, meansoppositely movable directly to control the functioning of said differentrotation-precluding means, and controlling means for said last-mentionedmeans adjustable in one direction positively to move the latter in onedirection to effect complete ineiectiveness of one of saidrotation-precluding means and having a yieldable thrust-transmittingconnection associated therewith through which upon adjustment in theopposite direction it moves said oppositely movable controlling meansyieldingly in the opposite direction to render the other of saidrotation-precluding means partially ineffective, said oppositely movablemeans having associated therewith an adjustable abutment to limit itsmovement under the yielding thrust transmitted thereto.

12. In combination, a reciprocating-type drilling motor, a guidetherefor, said motor when running producing alternating tendencies tomovement forwardly and rearwardly along said guide, members, of whichone is rotatably mounted, respectively carried by the guide and by themotor and mutually interengaged so that movement of the motor along theguide is precluded except upon rotation of said rotatable member, meansnormally operative to preclude material rotation of said rotatablemember in 'one direction including frictional binding means and meansfor pressing the s ame resilientlyinto a position substantiallyprecluding rotation of said rotatable member in said direction, meansnormally operative to preclude material rotation of said rotatablemember in the opposite direction including. frictional binding means andmeans for pressing the same resiliently into a position precludingsubstantial rotation ofsaid rotatable member in said oppositedirectiton, a controlling element having like ranges of operatingmovements in opposite directions from a pre; determined neutralposition, and means actuated thereby on its extreme movement in onedirection to render one of said frictional binding means fully operativeand the other fully inoperative and on its equal opposite operatingmovement from said neutral position to render said first mentionedfrictional binding means partially but not fully operative and the otherfully operative.

FRANK E. SINCLAIR.

